CURLOPT_ERRORBUFFER - error buffer for error messages
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char *buf);
Pass a char * to a buffer that libcurl
may store human readable error
messages on failures or problems. This may be more helpful than just the
return code from
curl_easy_perform(3) and related functions. The buffer
must be at least CURL_ERROR_SIZE bytes big.
You must keep the associated buffer available until libcurl no longer needs it.
Failing to do so will cause odd behavior or even crashes. libcurl will need it
until you call
curl_easy_cleanup(3) or you set the same option again to
use a different pointer.
Do not rely on the contents of the buffer unless an error code was returned.
Since 7.60.0 libcurl will initialize the contents of the error buffer to an
empty string before performing the transfer. For earlier versions if an error
code was returned but there was no error detail then the buffer is untouched.
Consider
CURLOPT_VERBOSE(3) and
CURLOPT_DEBUGFUNCTION(3) to better
debug and trace why errors happen.
NULL
All
curl = curl_easy_init();
if(curl) {
CURLcode res;
char errbuf[CURL_ERROR_SIZE];
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* provide a buffer to store errors in */
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
/* set the error buffer as empty before performing a request */
errbuf[0] = 0;
/* perform the request */
res = curl_easy_perform(curl);
/* if the request did not complete correctly, show the error
information. if no detailed error information was written to errbuf
show the more generic information from curl_easy_strerror instead.
*/
if(res != CURLE_OK) {
size_t len = strlen(errbuf);
fprintf(stderr, "\nlibcurl: (%d) ", res);
if(len)
fprintf(stderr, "%s%s", errbuf,
((errbuf[len - 1] != '\n') ? "\n" : ""));
else
fprintf(stderr, "%s\n", curl_easy_strerror(res));
}
}
Always
Returns CURLE_OK
CURLOPT_DEBUGFUNCTION(3),
CURLOPT_VERBOSE(3),
curl_easy_strerror(3),
curl_multi_strerror(3),
curl_share_strerror(3),
curl_url_strerror(3)